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Q6. a) With reference to shipboard sewage systems, describe the principle of operation of EACH of the following types: (10)

I. Flow through system;

II. Collection / Holding / transfer system;

III. Zero discharge system.

b) Explain why sewage systems involving aerobic action are to be preferred to those with anaerobic action. (10)

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2014/APR/04 - 2022/NOV/05

Q4. A. With reference to shipboard sewage systems, Describe the principle of operation of EACH of the following types -

I. Flow through system;

II. Collection / Holding / transfer system; III. Zero discharge system.

B. I. Explain why sewage systems involving aerobic action are to be preferred to those with anaerobic action.

Aerobic Action: II. Explain the meaning and significance of the term Biological oxygen demand.